On 10/24/07, Revital1 Eres <[EMAIL PROTECTED]> wrote: > > > The problem arises when we delete an insn from the df that contains a > > > use but do not update the def-use chain of it's def as we do not have > > > the use-def chain to reach it's def, This later causes a problem when > > > we try to dump the def-use chain of it's def. > > > > I'm sorry but I don't understand the description of the problem. > > What do you mean by "dump" and what problem does this "dump" cause ? > > By dump I mean printing the function including all the DU chain info > (in TODO_dump_func at the end of the pass). This causes a problem in > our case becuase an insn with a use was deleted (in df_insn_delete) > without unlinking it from the def-use chain of it's def (because we > can not access the def using a use-def chain - we do not build it). > Once we want to print the def's def-use chain we get an ICE. Hope this > explains the problem better.
I see. You're right, however, once an insn is deleted, the chain is not correct anyway (e.g. deleting an insn could expose a def to reach new uses that it didn't reach before) and it seems incorrect to keep using the chain without rebuilding them. Seongbae
